Hi Sir,
I'm a Drupal developer with over 6 years experience on Drupal. I can help to add the contact form to the node for the author to contact the comment author. This is about adding new code to a content type template and allow the author to click on a link to show the form, email of the comment author will be appended to that form automatically to archive this feature.
I just get started working here on Freelancer so I will give all my time and effort to complete your site in high quality.
Please share details of the project with me.
Thanks,
Nguyen